Nitrification and denitrifying phosphorus removal performance in the pre-A2 NSBR system
ZHAO Wei-hua1,2, LI Jian-wei1, WANG Mei-xiang1, HUANG Yu1, FENG Yan1, LI Xi-yao1, PENG Yong-zhen1
1. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China; 2. School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
Abstract：Biofilm nitrification and activated sludge denitrifying phosphorus removal performance were investigated in the pre-A2 NSBR system, which treated real low carbon to nitrogen (C/N) ratio domestic sewage. The effect of organic substance and NO2--N concentration on the biofilm nitrification performance, and different electronic acceptors on the denitrifying phosphorus uptake rate were studied. Results indicated that nitrification rate was 11.3 mgNH4+-N/(L·h), the ammonia volume loading was 0.27 kgNH4+-N/(m3·d) under the filling rate of 40%, the nitrification performance was inhibited by organic substance, but the system showed a good nitrification rate of 9.72 mg NH4+-N/(L·h) when organics presented. NO2--N treatment exhibited little effect on the AOB activity but obvious effect on the NOB activity, the NOB activity was almost completely inhibited (only 1.63%) when NO2--N concentration was 400mg/L. According to the phosphorus uptake rate experiment under different electronic acceptors, the phosphorus uptake rate under oxygen and NO3--N was 17.62mg P/(g VSS·h) and 12.94mg P/(g VSS·h), respectively, anoxic phosphate accumulating organisms (PAOs) occupied 73.4% of the total PAOs, phosphorus uptake performance was inhibited when the NO2--N concentration was 30mg/L, and phosphorus uptake performance was inhibited when the NO2--N concentration was 15mg/L under the condition of NO2--N and NO3--N coexisted.
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